Stainless Steel Water Pipe
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Why stainless steel for water lines?
Stainless steel doesn't rust, doesn't change the taste of water and doesn't scale up as quickly as galvanized steel pipe. It also handles the high temperatures used for thermal disinfection of hot-water systems, one of the common measures against Legionella. That is why stainless steel water pipe is widely used in building plumbing, water treatment plants, food and beverage plants and on ships.
304 or 316L for water?
For municipal water with typical chloride levels, 304 (1.4301) stainless pipe is usually enough. For water with higher chloride content, hot-water recirculation loops, private wells and coastal sites, the molybdenum-bearing 316L (1.4404) stainless pipe is the safer choice. The full range of sizes is in seamless tubes and hollow bars.
Metric sizes: pipe or tube?
In US practice, "pipe" usually means NPS sizes with a Schedule wall, while "tubing" is ordered by actual OD. Our pipes are made to European metric sizes: each product name gives the DN, the actual outside diameter and the wall thickness in millimeters. Metric ODs are close to, but not the same as, NPS pipe ODs, and the walls do not follow a Schedule. Check the OD against your fittings and the wall thickness against your design before ordering.
How to join stainless water pipe
The seamless pipes in this category are joined by TIG welding (with a back purge), with butt-weld fittings such as seamless elbows and seamless tees, or with compression fittings for metric OD. Press-connect systems require the system manufacturer's own pipe, matched to its fittings – our pipes are not a substitute for them. Avoid direct contact between stainless steel and copper or galvanized steel: in water they form a galvanic cell and the less noble metal corrodes faster. Use dielectric unions or insulating fittings at the transition.
Frequently Asked Questions
Is stainless steel suitable for drinking water?
Yes, stainless steel is widely used in potable water systems – it doesn't rust, doesn't affect the taste of water and resists scaling. We do not issue a declaration of conformity for drinking-water contact; the material is documented by an EN 10204 3.1 inspection certificate (on request, for a fee). If your project or local code requires a product listed to NSF/ANSI 61, confirm the requirements with your engineer before ordering.
304 or 316L for water?
304 for municipal water. 316L for well water with higher chloride levels, hot-water recirculation loops, chlorinated systems and coastal locations.
Will these pipes work with press-connect fittings?
Don't assume so. Press-connect systems require the system manufacturer's own pipe, matched to its fittings. The pipes in this category are joined by welding or with compression fittings.
Can I connect stainless steel to copper or galvanized pipe?
Not directly. In water the two metals form a galvanic cell and the less noble one corrodes faster. Use dielectric unions or insulating fittings at the transition.
Can the pipe handle thermal disinfection?
Yes, stainless steel tolerates the periodic high-temperature flushing of hot-water systems used against Legionella.
Are the sizes in inches or Schedule?
No, the sizes are metric. Each product name gives the DN, the actual OD and the wall thickness in millimeters. Metric ODs differ slightly from NPS ODs and the walls do not follow a Schedule, so choose fittings made for metric OD.
How do I choose the pipe diameter?
Based on the flow calculation in your plumbing design. Compare the actual OD and wall thickness in the product name with your drawings.
Are the pipes threaded?
No, the pipes are supplied with plain, saw-cut ends.
Can you cut the pipe to length?
Yes. You choose the length on the product page and we cut the pipe with a band saw, tolerance −0/+5 mm. A band saw does not leave a perfectly smooth cut face.
If I order several pieces, will they come as one length?
No, several pieces of the same product are shipped as separate lengths. Cutting to a different length is possible after consulting our shop staff.
Can I get a 3.1 certificate?
Yes, an EN 10204 3.1 inspection certificate (often called a mill test report, MTR) is available on request for a fee. It shows the grade, heat number and chemical composition of the material.
When will you ship my order?
We ship the order or have it ready for pickup within 3 business days after the payment is received. Within the EU we deliver by courier. If an order is fulfilled in parts, some items may arrive in a separate shipment.
Do you ship to the US?
Delivery outside the EU, including to the United States, is arranged individually. Email us the products and quantities and we will get back to you with the options.
Can I pick up the order in person?
Yes, at our warehouse at ul. Pszczyńska 140, Warszowice, Poland, once we have notified you that the order is ready for pickup.
Do you issue a VAT invoice?
Yes, we issue a VAT invoice for your order.
Can I return the goods?
Consumers may withdraw from the purchase within 14 days of delivery if the goods are unused and undamaged; the return shipping cost is paid by the buyer. Goods made to an individual order, i.e. with a specification other than on the product page, cannot be returned.
I need a larger quantity or a non-standard size – what should I do?
Email [email protected] or call +48 660 621 705. Tell us the product, grade, dimensions and quantity and we will prepare a quote.